Luminous electric heater.



W. F". HOWARD & A B. GOUSINS; LUMINOUS ELECTRIC H-E ATER. 'AIPIPLIGATIION FILED FEB. 1, 1909.

940,021 mnte 161909.

INVENTOR'S Z 5 MM F/wm/ WITNESSES ATTORNEYS UNITED STATES PAT ENT OFF ICE.

WILLIAM FRANK HOWARD, OF WEST EALING, AND ALIBAN BERTIE COUSINS, 0F ABI NG Dom oN-THA'MEs, ENGLAND.

LUMINOUS ELECTRIC HEATER.

Specification of Letters Patent.

Patented Nov. 16, 1909.

Application filed February 1, 1909. Serial No. 475,357.

To all whom it may concern:

Be it known that we, WILLIAM FRANK HOWARD and ALBAN 'BERTIE COUSINS, subjects of the King of Great Britain, and re siding, respectively, at \Vest Ealing, Middlesex, and 19 Park road, Abingdon-on- Thames, Berkshire, England, have invented certain new and useful Improvements in Luminous Electric Heaters, of which the following is a specification, such as will enable those skilled in the art to which it appertains to make and use the same.

This invention relates to luminous electric heaters consisting of an airtight bulb B of glass or other'sultable material from which all possible air is exhausted, containing a filament F usually made of carbon-or metal and attached to two leading in wires VV'W which are passed through the ends of the bulb B and sealed into it, and these wires WW are electrically connected to two massive metal caps or terminals TT securely fixed to the ends of the bulb B.

The letters refer-to the drawings accompanying this specification, of which,

Figure 1 is a plan view, Fig; 2 1s a sectional elevation showing the heating element held to the live contact blocks CC by set screws, Fig. 3 is a sectional elevation, and ;Fig. 4 is an end elevation showing the heating element held to the live contact blocks C-C by strong metal spring clips K-K.

' We place the two wires WW leading the electric current' to the filament F of the heating element, as far apart as possible, that is at the two opposite ends or sides of .the heating element also we make the heating elements with strong massive metal tcrmmals T-T that can be screwed to the live contact blocks CC of the heater frame with set screws S'S or held to the live contact blocks of the heater frame with strong massive metal spring clips KK, and in practice the circuit wires are connected with the heater l 'rame or the blocks CC in the usual manner If the method of 'fixin the heating elemen s to the live conta .15 blocks shown in Figs-l and 2 is used 5 is advisable to slot the holes in the ten mals TT through which the set screws -S--S are passed, and to insert under the head of the set screws SS spring washers (not shown on the accompanying drawings) so that the heating elements may be free to expand and contract slightly with changes of temperature.

Small tubular lamps for lighting purposes have been made in a manner some what similar to those shown in Figs. 3 and 4, but our invention does not relate to such lamps for lighting, asowing to thesmall current they consume and the lightness of the filament and the comparatively low temperature at which they work these small lamps have never given much trouble in practical use, the power dissipated by them seldom exceeding watts.

The large lamps usually used for heating purposes almost invariably dissipate a power of at least 250 watts, and thus run very hot and take a large current which rapidly destroys the type of contacts used on the lamps at present in use.

We make the heating elements with the whole of the terminals .TT of the heating elements bare so that they provide a large metallic surface for the pur ose of providing a good area of contact or the passage of the electric current. We also make these terminals T-T very massive so that they are not appreciably heated by the passage of the electric current through them. We also make the filament F of the heating element in a spiral wave or similar form which makes it very elastic and capable of withstanding rough usage and expansion and contraction due to varying temperatures.

In practice, if desired, the bulb b, or as shown in Figs. 2: and 4, a part of the bulb 6 maybe frosted, or coated, or ornamented in any desired manner, but this forms no essential part of our invention.

Having now particularly described and ascertained the nature of our said invention, and in what manner it is to be performed, we declare that what. we claim is 1. A luminous electric heater, consisting of a bulb of glass or other suitable material exhausted of air, and an electric filament of spiral or other longitudinally contractile form placed therein, said bulb being provided with massive metal terminals of low resistance and wires sealed in the ends thereof and to said terminals and with which said. filament is. electrically and mechanically connected, and said terminals beingadapted to be electrically and hiecharif lly connected with a he ter frame.

2. A luml ous electric heat; consisting 33% Minimum I In testimony that We claim r'he Zonagning n meat as our invention We have Signed our names p ovided in presence of the subsc ibing witnes 1 19th day of January 1909.

s sealed in zetlninais and T rm 30H filament is csnnected and ALBAN said 'ize'munai being adapted to eiectric- E' iim'sses: 51113" mechanically connected with LAVINIA ADAMS, 119 heater ill we. ALBERT S. PHILLIPS. 

